Feeding mechanism for single-interlock machines.



R. G. WO0DWARD. FEEDING MECHANISM FOR SINGLE INTERLOGK MACHINES APPLIOATI ON FILED JUNE 1, 190a.

1,12%,ML Patented Jan. 5, 1915.

5 SHEETS-SHEET 1.

r1 NORRIS PETERS CO.. PHOIO-LIYHA, WASHINGTON. I). l

R. G. WOODWARD. FEEDING MEOHANISM FOR SINGLE INTERLOGK MACHINES.

v APPLICATION FILED JUNE 1, 1903. L1%3%1 Patented Jan.5,1915.

6 SKEETS-SHEBT a.

HE NORRIS PETERS CO. FHOTO-LITHO" WASHINGTONv D. l

R. G. WOODWARD. FEEDING MECHANISM FOR SINGLE INTERLOGK MACHINES.

APPLIGATION FILED JUNE 1, 1903.

Patented Jan.5,191 5.

THE NORRIS PETERS 60.. PHOmL/THQ. WASHINGTON. D

R. G. WOODWARD. FEEDING MECHANISM FOR SINGLE INTERLOGK MACHINES.

APPLIGATIQN FILED JUNE 1 1903. 1 ,1 Q3$1 Patented Jan. 5, 1915.

5 SHEETS-SHEBT 1.

THE NORRIS PETER-5 CO.. PHOTO-LITHO.. WASHINGTUN. D C.

R. G. WOODWARD. FEEDING MECHANISM FOB. SINGLE INTERLOOKMACHINBS.

APPLICATION- FILED JUNE 1, 190a. Lmmm. 1 Patented Ja.11.5, 19 15.

6 SHEETS-SHEET 5.

Mi- Nnmem PETERS (70.. PHOTU-LITHIL. WA H/N(41UN. I) 1' WAUKEGAN, ILLINOIS, ASSIGNOR T0 UNION SPECIAL CHICAGO, ILLINOIS, A

CORPORATION OF ILLINOIS.

FEEDING MECHANISM FOR SINGLE-INTERLOCK MACHINES.

Application filed June 1, 1903.

To all whom it may concern:

Be it known that I, RUSSEL G. VVOODWARD, a citizen of the United States, residing at VVaukegan, in the county of Lake, State of Illinois, have invented certain new and useful Improvements in Feeding Mechanism for Single-Interlock Machines, of which the following is a description, reference being had to the accompanying drawing, and to the letters and figures of reference marked thereon.

My invention relates to an improvement in sewing machines, and particularly to a feeding mechanism therefor.

The especial object of the present invention is to provide a feeding mechanism for overseaming machines for finishing the edges of knit garments, and is herein shown as applied to av machine of the type known as the Union Special single interlock machine, which forms the subject matter of U. S. patent granted Lansing Onderdonk and myself November 27, 1906, No. 837,106, although it is of course applicable to other machines.

In the manufacture of hosiery goods, it is well known that it is desirable to crowd or pucker the goods ahead of the needle before the stitches are passed through the fabric, so that after the regular feed has taken place and the goods relax by reason of their elasticity, there will be no objectionable curl or pucker to the same. Various arrangements have been proposed for accomplishing this result, among which may be mentioned the arrangement of a feed dog with its surface inclined upwardly from rear to front, cooperating with a suitable presser foot, so that the part of the feed dog ahead of the needle will seize the goods first and crowd them to the needlebefore the other part catches hold of them. Other schemes devised have been two motion feeds, embodying two separate feed bars, one ahead of and one in rear of the needle, with means for actuating the former ahead of, in point of time, or at a greater rate of speed, than the other.

It is to the former type that the present invention relates, and the invention consists in the various matters hereinafter described and referred to in the appended claims.

The invention is illustrated in the accompanying drawings, in which;-

Figure l is a side elevation of a sewing Specification of Letters Patent.

Patented .1 an. 5, 1915.. Serial No. 159,659.

machine, of the type above mentioned, em-

odying my invention; Fig. 2 is a side view of the left hand part of the machine, with portions broken away, showing the feed depressed; Fig. 3 is a similar view with the feed raised; Fig. 4 is a front perspective view of the feed mechanism detached; Fig. 5 is a rear Fig. 6 is a side view of the feeding mechanism taken from the right hand side of the machine as viewed in Fig. 1; Fig. 7 is a section on line ilk-Q3, of Fig. 5; Fig. 7 is a detail in plan showing a section of the two feed bars, and in dotted lines the longitudinal slots in the slidable feed bar; Fig. 8 is an end view of the machine with the feed in depressed position; Fig. 9 is a similar view with the feed raised; Fig. 10 is a plan view of the throat plate; and Figs. 11-14 illustrate in perspective the different positions of the two feed dogs with respect to each other, during the cycle of movement.

In these drawings, A represents the machine bed, B the standard, C the gooseneck, D the needle lever, E the needle bar, F the main shaft, G the trimmer as a whole, H the cloth plate, and I the throat plate, and K the presser foot. The stitch-forming mechanism is of the three implement overseaming type, and comprises the needle (1, spreader or looping-hook, .7), and threadcarrying looper c. All the above named parts are of the construction set forth in a machine of the Union Special type above referred to, and need not be herein more particularly described.

As hereinbefore stated, the present invention relates particularly to a feeding mechanism for sewing machines, and this will now be described. It consists of two feed dogs 1 and 2. The forward feed dog 1, is formed on a curved bar 3, and is arranged in advance of the needle, a. It is attached by a screw 4 to the bar 5. which at its rear end is pivoted to the rocking frame 6, which is swung back and forth by connections to the main shaft F, these connections including av radially adjustable crank pin 7 and arm 8, substantially as in the well known Union Special feeding mechanism construction illustrated in Patent 299,568, of June 3rd, 1884, granted to Muther. and Dearborn. The bar 5 has a downward and horizontal projection 9. between which and the upper portion of the bar, is embraced the lifting perspective view of the same;

and lowering cam 10 on the driving shaft,

which is of the shape shown to give the.

vThe feed bar 12 is wider than the bar 5, as

shown in Fig. 7, and has downwardly depending flanges which engage the side faces of the feed bar 5. The portion of the feed bar, 12 adjacent the flanges, rests on shoulders 14, 14:, formed in the upper face of the feed bar 5. The upper face of the feed bar 12 is recessed to receive a plate 15. Screws 15 pass through the plate 15 and through elongated slots 15 in the feed bar 12, and are threaded into the'feed bar 5. This permits the feed bar 12 to reciprocate back and forth on the feed bar 5, but said feed bar 12 is moved up and down with the feed bar 5 through the action of the cam 10. By this arrangement, the bar 12throu gh the connections about, to be described, may reciprocate longitudinally independent of the bar 5. To give this longitudinal movement said bar 12 has screwed to it an arm 17, having a downwardly projecting rear end 18, having a ball and stud connection withithe pitman 19, having'an eccentric strapat its opposite end embracing an eccentric 21 on the face of the, ring 22, which is adjustably secured by bolts and nuts 23-, to a similar ring or plate 24. fixedly sleeved to the driving shaft F. This arrangement is similar to the arrangement shown in Patent 245,? 81, to W. F. Beardslee, thus providing an eccentric adjustable transversely across the main shaft for giving the forward and backward movement to the feed dog. By these arrangements, it will be seenthat while the two feed dogs move up and down under the action of a common lifting and lowering cam, that they have separate independent forward and backward movements imparted to them; that the lifting cam is so formed as to. give a dwell to the respective dogs at the proper time, the action distinguishing from the action of other two motion feeds in the respect that when theforward feed dog is operating to pucker or gather the goods, that the rear feed dog is substantially stationary and remains so until the forward feed dog has moved to practically close up. the gap between them, when they both perform the feeding action together, then the "forward feed dog stops its action and the rear one feeds, both dropping together. So also in the movement toward thefront of the machine, both feed dogs move upwardly together,,but, as above stated, the rear one is substantially; stationary while the; goods are crowdedto theneedle, and by reason of the shape of the liftingcam and of the timing of the two sets of eccentric mechanisms which operate the feed dogs, the movements of the respective dogs stop, and begin at the proper periods relatively to one another.

Assuming the needle to be in its lowest position and just about on the return, and the looper and spreader to be in their extreme backward positions, the two feed dogs are practically separated to their greatest extent, as shown in Fig. 11, although the rear dog has begun to move forward slightly. As the main shaft rotates, through the action of the eccentric, the front feed dog first moves forward toward the front and then the lifting portion of the cam begins to raise both feed dogs, as shown in Fig. 12, the rear dog still moving forward, while both dogs are being lifted to the position shown in Fig. 13, then there is a dwell in the longitudinal movement of the rear feed dog, but a forward movement of the front feed dog, until the position shown in Fig. 1 1 is reached, thus feeding the goods ahead of the needle, when the dogs move rearward together to feed the body of the goods, a short distance when the feeding movement of the front feed dog stops, but the movement toward the rear of the rear feed dog continues,

until the dogs begin to lower, when there is T a slight dwell in their longitudinal movement, until just before the limit of their depression is reached, when the forward feed dog moves toward the front of the machine slightly to separate the dogs, as shown in Fig. 12, then as they begin to rise, the rear dog begins to move toward the front slightly.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A feeding mechanism for sewing machines, comprising two feed bars, a feed (log carried by each feed bar, one of said feed dogs being located entirely in front of the needle, the other feed dog being located in rear of the needle, means for simultaneously raising and lowering said feed dogs, means for positively moving the feed dog in front of the needle back and forth and means for moving the feed dog in rear of the needle, positively back and forth, said means for operating the feed dogs being so constructed and timed, that the feed dog in front of the needle is moved to gather or pucker the goods, while the feed dog in rear of the needle is stationary, and so that said feed dogs will move together to feed the goods after the puckering or gathering action of the. feed dog in front of the needle.

2. A differential feeding mechanism for sewing machines including in combination, a feed bar, a feed dog carriedthereby, means for positively moving said feed bar back and forth, means for moving 'said feed bar up and down, a second feed bar mounted on said first named feed bar, so as to move vertically therewith, independent means for positively moving said second feed bar back and forth, and a feed dog carried by said second feed bar and engaging the fabric in rear of the first named feed dog, said means for moving said feed bars back and forth being so timed as to give one of the feed dogs an initial feeding movement While the other feed dog is substantially at rest.

3. The combination of a Work support, a needle, and a feeding mechanism, said feed ing mechanism including a feed bar located beneath the Work support, means for positively moving said feed bar back and forth, a feed dog carried by said feed bar, a second feed bar mounted on said first named feed bar and adapted to reciprocate relative thereto, a feed dog carried by said second feed bar, one of said feed dogs being located in front of the needle and the other feed dog in rear of the needle, and means for simultaneously raising and lowering said feed dogs, said means for reciprocating the feed dogs being so constructed and arranged as to give the feed dog in front of the needle its initial feeding movement While the other feed dog is substantially at rest.

4. The combination of a Work support, a needle and feeding mechanism, said feeding mechanism including a feed bar located beneath the Work support, a feed dog carried thereby, means for positively moving said feed bar back and forth, a second feed bar located beneath the Work support, a feed dog carried by said second feed bar, means for positively moving said second feed bar back and forth, and means for raising and lowering said feed bars, said means for moving the feed bars back and forth being so constructed and arranged as to give one of the feed dogs an initial feeding movement While the other feed dog is substantially at rest.

5. The combination of a Work support, a needle and a feeding mechanism, said feeding mechanism including a feed bar, a feed dog carried thereby, means for positively moving said feed bar back and forth, a secand feed bar, a feed dog carried thereby, means for positively moving said second feed bar back and forth, one of said feed dogs being located in front of the needle and the other in rear thereof, and means for moving said feed bars to cause said feed dogs to engage the material substantially simultaneously, said means for moving the feed bars back and forth being so constructed and timed as to give the feed dog in front of the needle an initial feeding movement While the other feed dog is substantially at rest.

In testimony whereof I aflix my in presence of two Witnesses.

RUSSEL G. WVOODVVARD.

Witnesses:

CHESTER MCNEIL, JULIUS SHIRE.

signature,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, D. C. 

